Orbula comitata


Classification: rads_cenozoic -> Theoperidae -> Bekomidae -> Orbula -> Orbula comitata
Sister taxa: O. comitata, O. discipulus, O. ducalis, O. sp.,

Taxonomy

Citation: Orbula comitata Foreman 1973
Rank: species
Basionym: Orbula comitata
Notes & discussion: Foreman 1973

Catalog entries: Orbula comitata

Original description: Cephalis subspherical, circular to subtriangular in transverse section, with thick wall, bearing a conical or rodlike apical horn and frequently tiny vertical and secondary lateral spines. Cephalis and proximal thorax poreless, surface minutely papillate, often with circular pore-shaped depressions. Collar stricture internally with six collar pores, the collar structures very weak, and rarely preserved whole (Figure 5). Externally contour of cephalis merges with thorax. Thorax with circular to subcircular pores very variable in size, quincuncially arranged in approximate longitudinal rows; surface tuberculate. Thorax subspherical when viewed laterally, circular to subtriangular in transverse Section. Three short, basally ridged feet extend from the thorax at the point where it begins to constrict. Aperture circular to subtriangular, surrounded by a rounded rim with surface ridged or minutely papillate.

(Based on fifteen specimens). Length of cephalis and thorax 160-185µm; greatest width of thorax 150-200µm. Distinguishing characters (rw): This species differs from O. ducalis in its smaller size and the shape of the cephalis and thorax, and from O. discipulus as described under that species.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:

Foreman, H. P. (1973a). Radiolaria of Leg 10 with systematics and ranges for the families Amphipyndacidae, Artostrobiidae, and Theoperidae. Initial Reports of the Deep Sea Drilling Project. 10: 407-474. gs :: ::


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Orbula comitata compiled by the radiolaria@mikrotax project team viewed: 5-7-2020

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Short stable page link: http://mikrotax.org/radiolaria/index.php?id=204837 Go to Archive.is to create a permanent copy of this page - citation notes



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